body {
    background-color: #1A1A1A;
    color: #EFEFEF;
    font-family: "DM Sans", sans-serif;
    font-weight: 400;
    font-style: normal;
    margin: 0;
    padding: 0;
}

a {
    color: inherit;
    text-decoration: none;
}

.main-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 2rem;
    background-color: #252525;
    border-bottom: 1px solid #3a3a3a;
}

.logo {
    font-family: "Jersey 10", sans-serif;
    font-size: 1.5rem;
    font-weight: 100;
    color: #00B8A3;
}

.main-nav ul {
    font-family: "Jersey 10", sans-serif;
    list-style-type: none;
    margin: 0;
    padding: 0;
    display: flex;
    gap: 2rem;
}

.main-nav a {
    font-size: 1rem;
    color: #a7a7a7;
    text-decoration: none;
    transition: color 0.2s ease-in-out;
}

.main-nav a:hover {
    color: #efefef;
}


.category-section {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid #3a3a3a;
}

.category-tag {
    background-color: #2D2D2D;
    font-family: "Jersey 10", sans-serif; 
    padding: 0.5rem 1rem;
    border-radius: 20px; 
    font-size: 1.4rem;
    cursor: pointer;
    transition: background-color 0.2s ease-in-out, color 0.2s ease-in-out;
    display: flex; 
    align-items: center;
    gap: 0.5rem; 
    color: #a7a7a7;
    appearance: none;
    border: none;
}

.category-tag:hover {
    background-color: #3a3a3a;
    color: #ffffff;
}

.category-tag.active {
    background-color: #EFEFEF; 
    color: #1A1A1A;
}

.category-icon {
    width: 18px;
    height: 18px;
}

.problem-list-container {
    max-width: 1300px;
    margin: 2rem auto;
    padding: 0 2rem;
}

.problem-tags-container form:nth-of-type(2) {
    display: flex;
    gap: 0.5rem;
}


.problem-tags-container {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;    
    margin-bottom: 1.5rem; 
}

.level-tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;     
    background-color: #3a3a3a; 
    color: #c9c9c9;           
    font-size: 0.9rem;
    line-height: 1.4;
    font-family: "Jersey 10", sans-serif;
    font-weight: 400;

    border: none;
    cursor: pointer;
}


.search-questions {
    background-color: #2D2D2D;
    border: 1px solid #4a4a4a;
    border-radius: 20px;
    color: #EFEFEF;
    padding: 0.4rem .9rem;
    font-family: "Jersey 10", sans-serif;
    font-size: 0.9rem;
    width: 250px;
    transition: border-color 0.2s ease-in-out;
}

.search-questions:focus {
    outline: none;
    border-color: #a7a7a7;
}

.search-questions::placeholder {
    color: #a7a7a7;
}

.level-tag:hover {
    background-color: #4a4a4a;
    color: #efefef;
}

.level-tag.bronze { 
    color: #CD7F32; 
}
.level-tag.silver { 
    color: #C0C0C0; 
}
.level-tag.gold   { 
    color: #FFD700; 
}
.level-tag.legendary {
    color: #9750DD;
}

.character-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
    padding-top: 1.5rem;
}

.character-card {
    height: 420px;
    width: 300px;
    transition: all 0.3s ease;
    flex-shrink: 0;
}

#category-section .topics-list li.hidden {
    display: none;
}

#category-section.is-expanded .topics-list li.hidden {
    display: list-item; 
}

.topics-list {
    display: flex;          
    flex-wrap: wrap;        
    gap: 1rem;             
    list-style: none;       
    padding: 0;             
    margin: 0;              

}

.expand-categories-li {
    margin-left: auto;
}

.expand-categories {
    appearance: none;
    border: none;
    margin: 0;
    background: transparent;
    font-family: "Jersey 10", sans-serif; 
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    padding: 0.5rem 2rem; 
    background-color: #333333; 
    color: #D1D1D1;
    border: 2px solid #4a4a4a;
    font-size: 0.9rem;
    font-weight: 500;
    border-radius: 50px; 
    transition: all 0.2s ease;
}

.expand-categories:hover {
    background-color: #444444;
    border-color: #00B8A3;
    color: #ffffff;
}